All/Most states will allow you to file an extension, but you have to pay the taxes on time (April 15). You need to file a Federal extension also, since your state taxes can effect your federal deductions. You still need to calculate your federal and state taxes as best you can by April 15. If you calculate your taxes and say you owe $500 Federal and $300 state, you need to file for an extension for both Federal and State, PLUS pay the $500 to Federal and $300 state by April 15. If you end up over estimating the dollar amounts, you will get a refund when you send in your taxes. If you underpaid, you will need to pay again.
